If you add just one or two pieces of equipment: a dumbbell, a kettlebell, a jump rope, a medicine ball, or a chinup bar, for example, you can increase the challenge even more.
如果你只用一两个器械的话：一个哑铃，一个壶铃，一条跳绳，一个健身实心球，或者一条杆（用作引体向上）等，都可以作为选择。你还可以对自己加大挑战。
The new disc consists of two stainless steel pieces that articulate against each another with a ball and trough design.
这种新椎间盘由两块不锈钢组成，相互之间有关节通过一种球体和槽体的设计对抗。
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